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Italian food is one of the most popular cuisines in the world, but how did it first make its way out of Italy?

In this edition of The Food Chain, Ruth Alexander uncovers stories of migration, food culture and legacy in the Italian diaspora.

Academic Donna Gabaccia explains why millions of Italians left their home country in the 1800s, creating new communities around the world that came to be known as ‘Little Italy’.

Ruth visits one of them, in London’s Clerkenwell, to discover its history and how a delicatessen founded in the late 1800s – still busy today – sparked a love for Italian cuisine.

We hear from an Italian restaurant owner in Buenos Aires, whose Genoese ancestors put their stamp on the local food scene more than 90 years ago.

And reporter Kizzy Cox takes a trip around some eateries in the world-famous Little Italy in New York City to see how the local community is moving with the times.

If you would like to get in touch with the show, please email: thefoodchain@bbc.co.uk

(Picture: Five contributors in the programme, from left to right: Lou di Palo, Luca Fadda, Hugo Banchero, Giorgia Fadda and Nico Paganelli, in front of a Little Italy sign. Credit: Getty Images/Â鶹Éç)

Presenter: Ruth Alexander
Producer: Elisabeth Mahy
Reporter: Kizzy Cox
Additional production: Veronica Smink and Matías Zibell Garcia